Insulator.



B. G. JAMIESON & G. A. KELLER.

INSULATOR. APPLICATION FILED MAY 4, 1909.

Patented Mar. 25, 1913.

BERTRAND G. JAMIESON AND CARL A. KELLER,-OF CHICAGO, ILLINOIS INSULATOR.

Specification of Letters Patent.

Patented Mar. 25, 1913.

Application filed May 4, 1909. Serial No. 493,865.

To all whom it may concern Be it known that we, BERTRAND G.-JAMlE' SONand CARL A. KELLER, citizens of the United States, residing at Chicago,in the county of Cook and State of Illinois, have invented a certain newand useful Improvement-in Insulators, of which the following is a full,clear, concise, and exact description, reference being had to theaccompanying drawings, forming a part of this specification.

Our invention relates to insulating devices, and is designed primarilyto provide an insulator which may be, in its preferred form, constructedof an insulating medium, consisting of material which is not affected byhigh temperature. It is very necessary that insulators, in theirordinary operation, be of such a character that the heating of theconductors, or any other heating eifects, will not injuriously influencetheir insulating qualities, and we have devised an insulating devicewhich is capable of meeting these requirements.

We will explain our invention more in detail by reference to theaccompanying drawing, illustrating one form of the invention and onemode of its application, in whichy Figure 1 shows how our invention maybe applied, and Fig. 2 is a detail view' of one form of insulator.

Referring to the drawing, We have shown a surrounding casing 1, withinwhich a busbar or other conductor 2 is placed, which bus-bar is designedto carry heavy currents and is thereby susceptible to great heatingeffects, not only due to itself but due to surrounding conditions. Inthe form of insulator which we have here shown, we mount this bus barwithin the casing 1, through the interposition of our improvedinsulators 3, 3, which are fastened to the sides of the casing 1,andwhich thus maintain the bus-bar in place irrespective of the heatingof said bus-bar.

Referring more particularly to Fig. 2,,

which illustrates in detail the insulators above referred to, we show abolt 4, which is provided with two nuts 5 and 6, by means of which theposition. of said bolt relative to said casing 1 can bedetermined, andthebolt properly mounted in position to support the bus-bar 2. The bolt4 has a head 7, and our invention contemplates the surrounding of the uper portion of the bolt 4, including thehea with a hydraulic cementproduct covering or head 8, which is firmly attached to the bolt 4. Thishydraulic oement head 8 is preferably impregnated with waterproofingcompound around its exposed surfaces, so' as to exclude moisture fromsaid head, and likewise said hydraulic cement head is so constructedthat excess moisture, which may be resent in its construction isexcluded be ore said .head has.

been completed and is ready for use. It is apparent from this that wehave a moistureproof medium interposed between the bolts 4 and thebus-bar 2, which moisture-proof medium, being constructed} of cement orsimilar material, is capable of withstanding the effects of heat to avery great extent, so that said insulator remains intact, even thoughthe normal temperature within the casing 1 has reached undueproportions.

While we have herein shown and particularly-described the preferredembodiment of our invention, we do not limit ourselves to the preciseconstruction and arrangement as herein set forth, but

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent is 1. An insulating device adapted to supportcurrent carrying conductors consisting of a bolt having its head incasedin an insulating medium, said medium adapted to rest against theconductor, a framework within which said bolt is mounted and a nut foradiusting the position of'said bolt against said conductor.

. 2. An insulating device adapted to support current carrying conductorsconsisting of a bolt having its head incased in an insulating medium,said medium adapted to rest against the conductor, a framework withinwhich said bolt is mounted, a nut for adjusting the position of saidboltagainst said conductor and a second nut for securing said bolt inplace.

3. An insulating device adapted to support current: carrying conductorsconsisting of a bolt having its-head incased in an insumemos iating heatresisting medium said medium scribe our names this 23d day of Apriladapted to rest against the conductor, a A. D 1909. framework withinwhich said bolt is mount- BERTRAND G. JAMIESON.

ed, a nut for adjusting the position of said CARL A. KELLER.

-' bolt against said conductor and a second Witnesses:

nut for securing said bolt in piece. MAX V7. ZABEL, in Witness whereof,we hereunto sub- JEAN ELLIOTT.

